Skeletal Ni catalysts prepared from Ni–Al alloys rapidly quenched at different rates: Texture, structure and catalytic performance in chemoselective hydrogenation of 2-ethylanthraquinone
| Autor: | Minghua Qiao, Fuzhong Xie, Huarong Hu, Xiaoxin Zhang, Shirun Yan, Hexing Li, Kangnian Fan, Heyong He, Baoning Zong, Yan Pei |
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| Rok vydání: | 2006 |
| Předmět: |
education.field_of_study
2-Ethylanthraquinone Hydrogen Inorganic chemistry Alloy Population chemistry.chemical_element engineering.material Alkali metal Catalysis Metal chemistry.chemical_compound chemistry visual_art visual_art.visual_art_medium engineering Leaching (metallurgy) Physical and Theoretical Chemistry education |
| Zdroj: | Journal of Catalysis. 237:143-151 |
| ISSN: | 0021-9517 |
| DOI: | 10.1016/j.jcat.2005.11.001 |
| Popis: | Skeletal Ni catalysts (RQ Ni) prepared by alkali leaching of rapidly quenched Ni–Al alloys have been systematically characterized, focusing on the effect of the cooling rate during alloy preparation. It is found that the residual Al content, texture, structure, surface hydrogen species, and active sites of the RQ Ni catalysts can be controlled by the cooling rate of the Ni–Al alloys. In liquid-phase hydrogenation of 2-ethylanthraquinone (eAQ), the RQ Ni catalyst with higher cooling rate favors hydrogenation of the carbonyl group and retards the saturation of the aromatic ring and the formation of the degradation products, thus leading to a higher yield of H 2 O 2 . Based on the characterizations, the improved selectivity is ascribed to the dominant population of strongly chemisorbed hydrogen, which is inactive for the hydrogenation of the aromatic ring, along with the electronic interaction between residual metallic Al and Ni, favoring a carbonyl group-bonded configuration of eAQ on the catalyst. |
| Databáze: | OpenAIRE |
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